Mindray A7 User manual

Anesthesia System

™

Service Manual

Anesthesia System

™

Service Manual

046-006272-00 A7™ Service Manual

A7™ is U.S. trademarks of Mindray DS USA, Inc.

Selectatec® is a registered trademark of Ohmeda.

any form without permission of Mindray DS USA, Inc.

A7™ Service Manual 046-006272-00 i

Table of Contents

Table of Contents ..................................................................................................................................................................................................................i

Foreword ..............................................................................................................................................................................................................................xxi

Warnings, Cautions, and Notes ....................................................................................................................................................................................xxi

Warnings...............................................................................................................................................................................................................................xxi

Cautions...............................................................................................................................................................................................................................xxii

Notes................................................................................................................................................................................................................................... xxiii

Theory of Operation ............................................................................................................................................ 1 - 1

Introduction..........................................................................................................................................................................................1 - 2

Electrical and Pneumatic Connections .......................................................................................................................................1 - 3

Electrical Connections .......................................................................................................................................................................................1 - 3

Pneumatic Connections (A7)...........................................................................................................................................................................1 - 6

Connections Between Pneumatic Circuit, Breathing System and Ventilator Control Board................................................ 1 - 11

Gas Flow .............................................................................................................................................................................................. 1 - 14

Pneumatic Circuit Diagram........................................................................................................................................................................... 1 - 14

Parts List............................................................................................................................................................................................................... 1 - 15

Key to Symbols.................................................................................................................................................................................................. 1 - 16

Description.......................................................................................................................................................................................................... 1 - 16

Anesthesia System Components ............................................................................................................................................... 1 - 47

Auxiliary Outlets................................................................................................................................................................................................ 1 - 47

Work Light Board.............................................................................................................................................................................................. 1 - 47

The Breathing System .................................................................................................................................................................... 1 - 49

Brief Introduction ............................................................................................................................................................................................. 1 - 49

Automatic Mode, Inspiration ....................................................................................................................................................................... 1 - 49

Automatic Mode, Expiration ........................................................................................................................................................................ 1 - 50

Manual Mode, Inspiration ............................................................................................................................................................................. 1 - 50

Manual Mode, Expiration............................................................................................................................................................................... 1 - 51

Pneumatic PEEP ................................................................................................................................................................................................ 1 - 52

Ventilator in Standby ...................................................................................................................................................................................... 1 - 52

Breathing System Components .................................................................................................................................................................. 1 - 52

Ventilator UI ....................................................................................................................................................................................... 1 - 54

Display.................................................................................................................................................................................................................. 1 - 54

CPU Board ........................................................................................................................................................................................................... 1 - 62

Ventilator Control and Drive........................................................................................................................................................ 1 - 65

Mother Board..................................................................................................................................................................................................... 1 - 65

Ventilator Control and Drive Board ........................................................................................................................................................... 1 - 75

Battery .................................................................................................................................................................................................................. 1 - 82

Infrared Communication Board .................................................................................................................................................................. 1 - 84

Anesthesia Signal Interface Board.............................................................................................................................................................. 1 - 85

Breathing System Heater............................................................................................................................................................................... 1 - 86

Electrical Flow Control System.................................................................................................................................................... 1 - 86

EFCS Monitoring Board .................................................................................................................................................................................. 1 - 86

BFCS Position Board ........................................................................................................................................................................................ 1 - 90

Total Flow Meter Backlight Board .............................................................................................................................................................. 1 - 91

O2/N2O/Air Flow Sensor Interface Board................................................................................................................................................ 1 - 91

Ventilator Pneumatic- O2 Drive Gas ......................................................................................................................................... 1 - 93

Ventilator Pneumatic Drive........................................................................................................................................................................... 1 - 93

Drive Pressure-High Pressure Regulator (200 kPa, 29 psi)................................................................................................................. 1 - 93

Drive Gas Assembly ......................................................................................................................................................................................... 1 - 93

Tube Color Coding........................................................................................................................................................................................... 1 - 93

Installation Guide ................................................................................................................................................ 2 - 1

Preparation - Additional Material Required ..............................................................................................................................2 - 2

Assembly................................................................................................................................................................................................2 - 3

Unpacking and Setup ........................................................................................................................................................................................2 - 3

Breathing System and Breathing System Accessories and Checkout Procedures ................................................................... 2 - 20

Vaporizers (if available) .................................................................................................................................................................................. 2 - 20

Monitoring Products Mounting and Electrical Connection (if available)..................................................................................... 2 - 21

Table of Contents

ii 046-006272-00 A7™ Service Manual

Software and License Key Installation...................................................................................................................................... 2 - 25

Functional Tests................................................................................................................................................................................ 2 - 25

Breathing System Leak Test.......................................................................................................................................................................... 2 - 25

Automatic Backup Flow Control Test........................................................................................................................................................ 2 - 32

Check the AG Module Accuracy (Only for A7's with an AG Module) ............................................................................................. 2 - 36

Gas Module Verification (for A7's with an AG Module)....................................................................................................................... 2 - 38

Gas Delivery System Tests............................................................................................................................................................................. 2 - 38

Check the Sensor Zero Point........................................................................................................................................................................ 2 - 42

Check the Flow Sensor Accuracy................................................................................................................................................................ 2 - 44

Check the Pressure Sensor Accuracy......................................................................................................................................................... 2 - 48

Total Flow Sensor Self Test............................................................................................................................................................................ 2 - 53

Pneumatic Leak Tests ..................................................................................................................................................................... 2 - 54

Line Pressure Gauges Accuracy Test ......................................................................................................................................................... 2 - 54

N2O Cylinder Leak Test .................................................................................................................................................................................. 2 - 54

O2 Cylinder Leak Test...................................................................................................................................................................................... 2 - 54

AIR Cylinder Leak Test..................................................................................................................................................................................... 2 - 55

Line Pressure Leak Tests................................................................................................................................................................................. 2 - 55

Breathing System Checks.............................................................................................................................................................. 2 - 57

Waste Gas Scavenger Test (if available) ................................................................................................................................................... 2 - 57

Internal Gas Connections Test..................................................................................................................................................................... 2 - 57

Drive Gas Pressure Loss Alarm, N2O Cutoff Test................................................................................................................................... 2 - 62

Performance Verification............................................................................................................................................................... 2 - 63

Manual Mode Ventilation Test..................................................................................................................................................................... 2 - 63

APNEA Alarm Test ............................................................................................................................................................................................ 2 - 63

Alarm Silence Test............................................................................................................................................................................................ 2 - 63

VCV Adult Ventilation Mode Test ............................................................................................................................................................... 2 - 64

VCV Adult Ventilation Mode Test 2............................................................................................................................................................ 2 - 64

VCV Child Ventilation Mode Test................................................................................................................................................................ 2 - 65

Airway Disconnect Alarm Test..................................................................................................................................................................... 2 - 66

PCV Adult Ventilation Mode Test ............................................................................................................................................................... 2 - 66

Pressure Support (PS) Ventilation Mode Test ........................................................................................................................................ 2 - 67

Alarms and Fail safe Functions.................................................................................................................................................... 2 - 68

Set Up.................................................................................................................................................................................................................... 2 - 68

Low O2 Alarm Test........................................................................................................................................................................................... 2 - 68

High O2 Alarm Test.......................................................................................................................................................................................... 2 - 68

Peak Pressure Alarms Test............................................................................................................................................................................. 2 - 69

Minute Volume Alarm Test ........................................................................................................................................................................... 2 - 69

Miscellaneous Tests......................................................................................................................................................................... 2 - 70

Test the Line Voltage Alarm.......................................................................................................................................................................... 2 - 70

Top Light and Auxiliary Light Test.............................................................................................................................................................. 2 - 70

Touchpad Test................................................................................................................................................................................................... 2 - 70

Module Rack Functional Test (Only for A7's with an AG Module) .................................................................................................. 2 - 70

Vaporizer Interlock Test................................................................................................................................................................. 2 - 71

For 2 vaporizer Mount .................................................................................................................................................................................... 2 - 71

For 3 vaporizer Mount .................................................................................................................................................................................... 2 - 71

Vaporizer Accuracy Test ................................................................................................................................................................ 2 - 72

Suction Regulator Test................................................................................................................................................................... 2 - 72

Electrical Tests................................................................................................................................................................................... 2 - 73

Auxiliary Electrical Outlet Test ..................................................................................................................................................................... 2 - 73

Electrical Safety Inspection Test.................................................................................................................................................................. 2 - 73

Electrical Safety Inspection Form................................................................................................................................................................ 2 - 73

Periodic Maintenance.......................................................................................................................................... 3 - 1

Maintenance Schedule .....................................................................................................................................................................3 - 2

Periodical Maintenance Consumable Parts Kits ......................................................................................................................3 - 2

Periodical Maintenance Schedule ................................................................................................................................................3 - 2

Checklist before surgery...................................................................................................................................................................3 - 3

Visual Inspection Checklist ..............................................................................................................................................................3 - 4

List of Periodic Maintenance Parts to be Replaced and Checked .....................................................................................3 - 4

A7™ Service Manual 046-006272-00 iii

Table of Contents

Battery Maintenance and Replacement .....................................................................................................................................3 - 8

Functional Tests...................................................................................................................................................................................3 - 8

Breathing System Leak Test.............................................................................................................................................................................3 - 9

Automatic Backup Flow Control Test........................................................................................................................................................ 3 - 16

Check the AG Module Accuracy (Only for A7's with an AG Module) ............................................................................................. 3 - 19

Gas Module Verification (for A7's with an AG Module)....................................................................................................................... 3 - 21

Gas Delivery System Tests............................................................................................................................................................................. 3 - 21

Check the Sensor Zero Point........................................................................................................................................................................ 3 - 25

Check the Flow Sensor Accuracy................................................................................................................................................................ 3 - 27

Check the Pressure Sensor Accuracy......................................................................................................................................................... 3 - 31

Total Flow Sensor Self Test............................................................................................................................................................................ 3 - 36

Pneumatic Leak Tests ..................................................................................................................................................................... 3 - 36

Line Pressure Gauges Accuracy Test ......................................................................................................................................................... 3 - 36

N2O Cylinder Leak Test .................................................................................................................................................................................. 3 - 37

O2 Cylinder Leak Test...................................................................................................................................................................................... 3 - 37

AIR Cylinder Leak Test..................................................................................................................................................................................... 3 - 37

Line Pressure Leak Tests................................................................................................................................................................................. 3 - 38

Breathing System Checks.............................................................................................................................................................. 3 - 40

Waste Gas Scavenger Test (if available) ................................................................................................................................................... 3 - 40

Internal Gas Connections Test..................................................................................................................................................................... 3 - 40

Drive Gas Pressure Loss Alarm, N2O Cutoff Test................................................................................................................................... 3 - 45

Performance Verification............................................................................................................................................................... 3 - 46

Manual Mode Ventilation Test..................................................................................................................................................................... 3 - 46

APNEA Alarm Test ............................................................................................................................................................................................ 3 - 46

Alarm Silence Test............................................................................................................................................................................................ 3 - 46

VCV Adult Ventilation Mode Test ............................................................................................................................................................... 3 - 47

VCV Child Ventilation Mode Test................................................................................................................................................................ 3 - 47

Airway Disconnect Alarm Test..................................................................................................................................................................... 3 - 48

PCV Adult Ventilation Mode Test ............................................................................................................................................................... 3 - 48

Pressure Support (PS) Ventilation Mode Test ........................................................................................................................................ 3 - 49

Alarms and Fail safe Functions.................................................................................................................................................... 3 - 49

Set Up.................................................................................................................................................................................................................... 3 - 49

Low O2 Alarm Test........................................................................................................................................................................................... 3 - 50

High O2 Alarm Test.......................................................................................................................................................................................... 3 - 50

Peak Pressure Alarms Test............................................................................................................................................................................. 3 - 50

Minute Volume Alarm Test ........................................................................................................................................................................... 3 - 51

Miscellaneous Tests......................................................................................................................................................................... 3 - 52

Test the Line Voltage Alarm.......................................................................................................................................................................... 3 - 52

Top Light and Auxiliary Light Test.............................................................................................................................................................. 3 - 52

Touchpad Test................................................................................................................................................................................................... 3 - 52

Module Rack Functional Test ....................................................................................................................................................................... 3 - 52

Vaporizer Interlock Test................................................................................................................................................................. 3 - 53

For 2 vaporizer Mount .................................................................................................................................................................................... 3 - 53

For 3 vaporizer Mount .................................................................................................................................................................................... 3 - 53

Vaporizer Accuracy Test ................................................................................................................................................................ 3 - 54

Suction Regulator Test................................................................................................................................................................... 3 - 54

Electrical Tests................................................................................................................................................................................... 3 - 55

Auxiliary Electrical Outlet Test ..................................................................................................................................................................... 3 - 55

Electrical Safety Inspection Test.................................................................................................................................................................. 3 - 55

Electrical Safety Inspection Form................................................................................................................................................................ 3 - 56

Calibration............................................................................................................................................................ 4 - 1

Introduction..........................................................................................................................................................................................4 - 2

Calibration Warnings, Precautions, and Notes.........................................................................................................................4 - 2

Warnings.................................................................................................................................................................................................................4 - 2

Cautions..................................................................................................................................................................................................................4 - 2

Notes........................................................................................................................................................................................................................4 - 3

System Calibration..............................................................................................................................................................................4 - 3

O2 Sensor Calibration ........................................................................................................................................................................................4 - 4

Table of Contents

iv 046-006272-00 A7™ Service Manual

Flow Calibration (User)................................................................................................................................................................................... 4 - 13

Flow Calibration (Service).............................................................................................................................................................................. 4 - 17

Pressure Calibration (Service) ...................................................................................................................................................................... 4 - 52

Pressure and Flow Zeroing (Service) ......................................................................................................................................................... 4 - 69

EFCS Zeroing (User) ........................................................................................................................................................................................ 4 - 73

Total Flow Sensor Calibration (factory) .................................................................................................................................................... 4 - 77

Calibrate the AG Module ............................................................................................................................................................................... 4 - 80

Cylinder Yoke Regulator Calibration ......................................................................................................................................................... 4 - 81

Adjust the back pressure valve.................................................................................................................................................................... 4 - 84

Repair and Troubleshooting............................................................................................................................... 5 - 1

Troubleshooting Guidelines ...........................................................................................................................................................5 - 2

Identify the problem ..........................................................................................................................................................................................5 - 2

Avoid shorting component leads together...............................................................................................................................................5 - 2

Use the proper equipment ..............................................................................................................................................................................5 - 2

Clean up the repair area....................................................................................................................................................................................5 - 2

Technical Alarms Check....................................................................................................................................................................5 - 3

Startup Alarm Messages ...................................................................................................................................................................................5 - 4

CPU Board Runtime Alarm ...............................................................................................................................................................................5 - 8

Power Board Runtime Alarm...........................................................................................................................................................................5 - 8

Runtime Alarms of Flow Sensor Board ..................................................................................................................................................... 5 - 10

Ventilator Control Board Runtime Alarm................................................................................................................................................. 5 - 16

Real-time Alarms of External AG Module................................................................................................................................................. 5 - 19

Runtime Alarms of Internal AG Module ................................................................................................................................................... 5 - 22

Pneumatic Circuit System Problems......................................................................................................................................... 5 - 23

Tools for on-site Maintenance ..................................................................................................................................................................... 5 - 23

Gas Supplies and Drive Gas .......................................................................................................................................................................... 5 - 32

Anesthetic Gas Delivery System.................................................................................................................................................................. 5 - 41

Breathing System ............................................................................................................................................................................................. 5 - 53

Tidal Volume ...................................................................................................................................................................................................... 5 - 68

Sensors and Valves Problems ...................................................................................................................................................... 5 - 71

Correspondence with Pneumatic Circuit Components ..................................................................................................................... 5 - 71

Correspondence with Hardware Components ..................................................................................................................................... 5 - 71

Preparations before Using Diagnostic Tests........................................................................................................................................... 5 - 73

Zero Points of Flow & Pressure Sensors Problems ............................................................................................................................... 5 - 73

Connections and Measurement of the Flow Sensors Problems...................................................................................................... 5 - 73

Connections and Measurement of the Pressure Sensors Problems .............................................................................................. 5 - 74

Opening State of the Inspiratory Valve Problems ................................................................................................................................ 5 - 76

Opening States of the PEEP Safety Valve Problems............................................................................................................................. 5 - 76

Opening State of the PEEP Valve Problems............................................................................................................................................ 5 - 77

Basal Flow Adjustment of O2 Needle Valve............................................................................................................................................ 5 - 78

Hardware and Electrical Problems............................................................................................................................................. 5 - 80

Software Update and Software Configuration Activation................................................................................................ 5 - 82

Factory Setup .................................................................................................................................................................................... 5 - 87

Repair and Disassembly ...................................................................................................................................... 6 - 1

Prepare for Disassembly...................................................................................................................................................................6 - 2

Tools.........................................................................................................................................................................................................................6 - 2

Preparations ..........................................................................................................................................................................................................6 - 2

Bleed Gas Pressure..............................................................................................................................................................................................6 - 2

Disassemble the Assemblies...........................................................................................................................................................6 - 3

Disassemble the Internal Assemblies of the Machine Upper Half.....................................................................................................6 - 3

Disassemble Hardware Box .......................................................................................................................................................................... 6 - 14

Disassemble the Work Surface .................................................................................................................................................................... 6 - 27

Disassemble the Auxiliary Work Surface.................................................................................................................................................. 6 - 37

Disassemble the Display ................................................................................................................................................................................ 6 - 39

Remove the Module Rack Assembly ......................................................................................................................................................... 6 - 48

Remove the Module Rack Fan ..................................................................................................................................................................... 6 - 49

Remove the Panel of Pressure Gauges ..................................................................................................................................................... 6 - 50

Disassemble the Vacuum Suction Related Assembly ......................................................................................................................... 6 - 58

Remove the Auxiliary Gas Outlet Assembly............................................................................................................................................ 6 - 60

Remove the Rotating Block of Breathing Circle .................................................................................................................................... 6 - 61

A7™ Service Manual 046-006272-00 v

Table of Contents

Remove the AGSS Assembly ........................................................................................................................................................................ 6 - 62

Remove the Electronically Controlled ACGO Drive Valve.................................................................................................................. 6 - 63

Remove the Built-in Anesthesia Module.................................................................................................................................................. 6 - 64

Remove the ACGO Assembly (electronically controlled)................................................................................................................... 6 - 66

Remove Anesthesia Module Inlet Pipeline Assembly......................................................................................................................... 6 - 67

Disassemble the Base Assembly ................................................................................................................................................................. 6 - 68

Disassemble the Breathing System........................................................................................................................................... 6 - 77

Remove the Breathing Tubes....................................................................................................................................................................... 6 - 77

Remove the Flow Sensor ............................................................................................................................................................................... 6 - 78

Remove the Manual Bag................................................................................................................................................................................ 6 - 79

Remove the Absorbent Canister................................................................................................................................................................. 6 - 80

Remove the CO2 Bypass Assembly............................................................................................................................................................ 6 - 82

Remove the Prepak Handle .......................................................................................................................................................................... 6 - 83

Remove the Contact Switch of the L-shaped Handle ......................................................................................................................... 6 - 84

Remove the Patient Circle Assembly......................................................................................................................................................... 6 - 85

Remove the Bellows Assembly.................................................................................................................................................................... 6 - 86

Remove the Pop-off Valve Assembly ........................................................................................................................................................ 6 - 87

Disassemble the Expiratory/Inspiratory Check Valve Assemblies .................................................................................................. 6 - 88

Remove the Water Collection Cup............................................................................................................................................................. 6 - 89

Remove the Airway Pressure Gauge ......................................................................................................................................................... 6 - 90

Remove the Bag Arm ...................................................................................................................................................................................... 6 - 90

Remove the Back Upper Cover and Back Lower Cover Assemblies............................................................................................... 6 - 91

Remove the Front Upper Cover, Median Plate and Front Lower Cover Assemblies ............................................................... 6 - 93

Disassemble the Automatic/Manual Ventilation Switch Assembly............................................................................................... 6 - 96

Remove the APL Valve Assembly ............................................................................................................................................................... 6 - 98

Replacement Parts............................................................................................................................................... 7 - 1

Introduction..........................................................................................................................................................................................7 - 2

Ordering Replaceable Parts .............................................................................................................................................................................7 - 2

Diagrams and Tables..........................................................................................................................................................................................7 - 3

Warranty............................................................................................................................................................... 8 - 1

Disclaimers ............................................................................................................................................................................................8 - 2

Manufacturer's Responsibility........................................................................................................................................................8 - 2

Phone Numbers and How to Get Assistance ............................................................................................................................8 - 2

Password................................................................................................................................................................................................8 - 2

Table of Contents

vi 046-006272-00 A7™ Service Manual

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A7™ Service Manual 046-006272-00 xxi

Foreword Introduction

Foreword

This Service Manual is intended as a guide for technically qualified personnel performing repair and

calibration procedures.

Warnings, Cautions, and Notes

Please read and adhere to all warnings, cautions, and notes listed here and in the appropriate areas

throughout this manual.

A WARNING is provided to alert the user to potential serious outcomes (death, injury, or serious

adverse events) to the patient or the user.

A CAUTION is provided to alert the user to use special care necessary for the safe and effective use of

the device. They may include actions to be taken to avoid effects on patients or users that may not be

potentially life threatening or result in serious injury, but about which the user should be aware.

Cautions are also provided to alert the user to adverse effects on this device of use or misuse and the

care necessary to avoid such effects.

A NOTE is provided when additional general information is applicable.

Warnings

WARNING: Whenever using anesthetic gases, nitrous oxide, oxygen, or any

hospital gas, always follow the appropriate agent evacuation/

collection procedures. Use the hospital gas evacuation system.

WARNING: Use only an approved lubricant on any O-ring in contact with oxygen.

Krytox® is the recommended oxygen service lubricant.

WARNING: For continued protection against fire hazard, replace all fuses with the

specified type and rating.

WARNING: In order to prevent an electric shock, the machine (protection class I)

may only be connected to a correctly grounded mains connection

(socket outlet with grounding contact).

WARNING: Remove all accessory equipment from the shelf before moving the

anesthesia machine over bumps or on any inclined surface. Heavy top

loading can cause the machine to tip over causing injury.

WARNING: Possible explosion hazard. Do not operate machine near flammable

anesthetic agents or other flammable substances. Do not use

flammable anesthetic agents (e.g., ether or cyclopropane.)

WARNING: The use of anti-static or electrically conductive respiration tubes, when

utilizing high frequency electric surgery equipment, may cause burns

and is therefore not recommended in any application of this machine.

WARNING: Possible electric shock hazard. The machine may only be opened by

authorized service personnel.

Introduction Cautions

xxii 046-006272-00 A7™ Service Manual

WARNING: Compressed gasses are considered Dangerous Goods/Hazardous

Materials per I.A.T.A (International Air Transport Association). and

D.O.T. (Department Of Transport) regulations. It is a violation of federal

and international law to transport dangerous goods without the

packages being appropriately identified, packed, marked, classified,

labeled and documented according to D.O.T. and I.A.T.A. regulations.

Please refer to the applicable I.A.T.A. Dangerous Goods Regulations

and /or the Code of Federal Regulations 49 (Transportation, Parts 171-

180) for further information.

WARNING: Avoid exposure to respiratory gases by always directing the fresh gas

flow from the fresh gas outlet to the waste gas scavenger.

WARNING: When using the AG module to perform AG measurements on the

patients who are receiving or have recently received anesthetic

agents,connect the outlet to the waste gas disposal system to prevent

the medical staff from breathing in the anesthetic agents.

WARNING: Remove the airway sampling line from the patient’s airway and seal the

sample port while nebulized medications are being

delivered.Nebulized medications interfere with accuracy gas reading.

WARNING: Before connecting the exhaust line to the sample gas outlet on the

compact airway module,ensure the other end is connected to the

sample gas return port on the anesthesia machine.Incorrect

connections may cause patient injury.

WARNING: Perform factory calibration in the working environment after

completion of anesthesia machine assembling.Contact us if factory

calibration is required during system use.

WARNING: Do not perform testing or maintenance on A7 anesthesia machine

while it is being used on a patient.Possible injury can result.

WARNING: Items can be contaminated due to infectious patients.Wear sterile

rubber gloves.Contamination can spread to you and others.

WARNING: Obey infection control and safety procedures.Used equipment may

contain blood and body fluids.

Cautions

CAUTION: This device uses high pressure compressed gas. When attaching or

disconnecting backup gas cylinders, always turn the cylinder valves

slowly. Use the A7 flow meters to bleed down the pressure, watching

the cylinder gauge indicate the depleting cylinder pressure, before

disconnecting the cylinder from the yoke. Always open and close

cylinder valves fully.

CAUTION: This device operates using compressed gas at high pressures from the

hospital central supply. When connecting gas supply lines attach the

hose connection to the machine before connecting the quick

disconnect fitting to the hospital source. Disconnect the supply hose

from the hospital source connection prior to disconnecting it from the

A7 gas connection fittings.

CAUTION: Refer to section 3.3 Periodical Maintenance Schedule for assistance

when performing scheduled periodic maintenance.

A7™ Service Manual 046-006272-00 xxiii

Notes Introduction

CAUTION: Do not leave gas cylinder valves open if the pipeline supply is in use

and the system master switch is turned to 'ON'. If used simultaneously,

cylinder supplies could be depleted, leaving an insufficient reserve

supply in the event of pipeline failure.

CAUTION: Use cleaning agent sparingly. Excess fluid could enter the machine,

causing damage.

CAUTION: This machine must only be operated by trained, skilled medical staff.

CAUTION: Perform the electrical safety inspection as the last step after

completing a repair or after routine maintenance. Perform this

inspection with all covers, panels, and screws installed.

CAUTION: After changing the CO2 absorbent, carry out a vaporizer and system

leak test.

CAUTION: Only Selectatec™ compatible vaporizers with Interlock-System may be

used with the A7 unit.

CAUTION: After each exchange of a vaporizer, carry out a system Leak test.

CAUTION: Do not clean the machine while it is on and/or plugged in.

CAUTION: Pressing "cancel" at any time during the procedure will cancel the

session's settings and reload the previously-stored calibration

coefficients.

CAUTION: Depleted sodalime changes color. Replace the sodalime if

approximately 2/3 of the absorber content is discolored. CO2 absorbent

can be safely changed without stopping mechanical ventilation.

CAUTION: This equipment contains parts sensitive to damage by electrostatic

discharge (ESD). Use ESD precautionary procedures when touching,

removing, or inserting parts or assemblies.

CAUTION: The watertrap collects water drops condensed in the sampling tube and

therefore prevents them from entering the AG module.If the collected

water reaches a certain amount, you should drain it to avoid airway

blockage.

CAUTION: The watertrap has a filter preventing bacterium,vapor and patient

secretions from entering the module.After a long-term use,dust or

other subtances may compromise the performance of the filter or even

block the airway.In the case, replace the watertrap.Replacing the

watertrap once a month is recommended.

CAUTION: Strong scavenging suction on the AG monitor exhaust port nay change

the operating presure of the monitor and cause inaccurate readings or

internal damage.

Notes

NOTE: Unauthorized servicing may void the remainder of the warranty. Check

with the factory or with a local authorized distributor to determine the

warranty status of a particular instrument.

Introduction Notes

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A7™ Service Manual 046-006272-00 1 - 1

1.0

Theory of Operation

Introduction .................................................................................................................................................................................................1-2

Electrical and Pneumatic Connections .......................................................................................................................................1-3

Gas Flow ......................................................................................................................................................................................................1-14

Anesthesia System Components................................................................................................................................................. 1-47

The Breathing System.........................................................................................................................................................................1-49

Ventilator UI...............................................................................................................................................................................................1-54

Ventilator Control and Drive ........................................................................................................................................................... 1-54

Electrical Flow Control System......................................................................................................................................................1-86

Ventilator Pneumatic- O2 Drive Gas...........................................................................................................................................1-93

Introduction Theory of Operation

1 - 2 046-006272-00 A7™ Service Manual

1.1 Introduction

The A7 Anesthesia System is a simple and convenient anesthetic gas delivery system that produces

anesthesia gas and controls delivery of anesthesia gas by using a configured vaporizer. It supports

automatic and manual ventilation. It can also monitor various parameters of patients, such as the

airway pressure, inspired tidal volume and expired tidal volume.

The A7 fresh gas electronic flow metering system inherits the features of a traditional anesthesia

system and moreover is enhanced in ease of use. The dual-tube electronic flow meter displays more

precise readouts. A knob guard prevents inadvertent movement of the flow control knobs. Gas

supply gauges indicate the pipeline and cylinder gas supply pressures in real time. An auxiliary O2

flow meter is placed on the upper left to make it convenient to read the O2 flow rate. The O2 flush

button is in the traditional position near the front left corner of the table top.

Safety systems within the A7 work to prevent hypoxic mixtures from being delivered to the patient.

Nitrous oxide will not be delivered unless oxygen pressure is present.

The heating system of the A7 patient breathing circuit minimizes condensed water and sends warm

and humidified gas back to the patient. The pressure gauge, APL valve and manual breathing bag of

the patient breathing circuit support fast plug and unplug to facilitate their installation and

maintenance. The APL valve has a rotary knob that provides a clear view of the manual breathing

pressure setting. The sodalime absorber canister can be opened and closed quickly through a handle.

It can absorb sodalime in standard Pre-paks or loose-fill sodalime. A drainage valve is configured for

the sodalime absorber canister.

Two flow sensors are configured on the patient breathing circuit to monitor the flow of inspired and

expired gases and monitor the airway pressure. The operator can rotate and fix the patient breathing

circuit as required. In addition, the patient breathing circuit is equipped with a side plug for gas

leakage detection. The Anesthesia Gas Scavenging System (AGSS) connectors are at the rear of the

A7.

When the A7 uses AC power supply, the A7 power management system supplies power for its main

system while charging its internal battery. In case of an AC power failure, the A7 operates on battery

power, two new batteries supporting normal running in a minimum of 90 minutes. The main system

switch can power on and off the system. The four auxiliary AC sockets on the A7 at the rear of the

machine operate independent of the main system switch.

NOTE: The warmer for the patient breathing circuit system does not operate

when the A7 is working on battery power.

NOTE: If the main switch is set to OFF, the O2 supply is turned off.

A7™ Service Manual 046-006272-00 1 - 3

Theory of Operation Electrical and Pneumatic Connections

1.2 Electrical and Pneumatic Connections

1.2.1 Electrical Connections

FIGURE 1-1

Electrical and Pneumatic Connections Theory of Operation

1 - 4 046-006272-00 A7™ Service Manual

No. Description P/N

B1 Power Board (A7) 115-018145-00

B2 Battery Interface Board 801-0631-00109-00

B3 CPU Board

115-040636-00

(EPSON)

115-052903-00 (DSP)

115-056939-00

(EPSON, New)

115-056942-00 (DSP,

New)

B4 IndicatorLight Board 051-001257-00

B5 Infrared Communication Board 801-0621-00165-00

B6 Anesthesia Signal Interface Board 801-0613-00033-00

B7 Display Interface Board 051-001258-00

B8 Backlight Inverter Board

051-001519-00 (old)

051-002583-00 (new)

B9 Warning Light Board 801-0631-00019-00

B10 Touchscreen Control Board 801-0631-00018-00

B11 Encoder Board 051-001260-00

B12 Flow Meter Lighting Board

Part of 115-018165-

00(FDA)

Part of 115-018166-

00(Canadian)

B13 Top Lighting Board 801-0631-00039-00

B14 Mother Board

051-001259-00

051-002950-00 (VGA)

B15-16 Ventilator Control Board

801-0631-00027-00

(EPSON)

115-058771-00 (DSP)

B17 Sensor Interface Board

801-0631-00089-00

(EPSON)

B18 Electronic Flow Control System (EFCS) Control Board 115-018150-00

B19 Air Flow Sensor Interface Board 051-002721-00

B20 Nitrous Oxide Flow Sensor Interface Board 051-002721-00

B21-22 O2 Flow Sensor Interface Board 051-002721-00

B23 Total Flow Meter Backlight Board Part of 115-014479-00

B24 BFCS Position Board 051-001286-01

P1 Filter Power 250VAC 15A Panel Mount 801-0631-00029-00

P2 Breaker(10.0A) 801-0631-00030-00

P3-6 Breaker(3.0A) 801-0631-00031-00

P7-10 Auxiliary Output Socket 801-0631-00032-00

P11 Speaker and Connecting cable 801-0631-00038-00

P12 Hardware Box Fan 801-0631-00028-00

P13-14 Lithium-ion Battery 115-018012-00

P15 Button Cell M05-010R03---

P16 Touchpad 801-0631-00052-00

P17 Gas Bench Fan 024-000407-00

A7™ Service Manual 046-006272-00 1 - 5

Theory of Operation Electrical and Pneumatic Connections

P18 Touch Screen 801-0631-00014-00

P19 LCD 115-039181-00

P20-21 Rotary Encoder 010-000150-00

P22 Cable, Lighting Switch 009-000981-00

P23 Circuit Heater 115-034450-00

C1-4 Cable, Power, AC Internal 009-000985-01

C5 Cable, Auxiliary Outlet 009-000984-00

C6 Cable, AC power 009-000983-00

C8 Cable, Indicator 009-000977-00

C9 Cable, System Switch 009-001776-00

C10 Cable, Touchpad 009-000972-00

C11 Cable, Patient Monitor 009-002927-00

C12 Cable, ACGO Valve Status 009-002940-00

C13 Cable, Internal AG Module 009-003131-00

C14 Cable, Display 009-000973-00

C15

0631 inverter control high-voltage lines (old)

0632 screen backlight output cable (new)

009-000974-00 (old)

009-006731-00 (new)

C16

0631 inverter cable B (old)

0635 screen LED backlight input cable (new)

009-000988-00 (old)

009-006382-00 (new)

C17 Cable, Alarm 009-000976-00

C18 Cable, Touch Screen 009-000978-00

C19 Cable, Encoder Board 009-002932-00

C20 Cable, Display Lighting 009-000986-00

C21 Cable, Top Lighting A 009-000982-00

C22 Cable, O2 Pressure Switch 0621-20-69588

C24 2-pin O2 Sensor Pedestal 801-0631-00067-00

C25 Cable, Circuit Switch 0621-20-78593

C26 Cable, Sodalime Canister Switch Cable 009-000987-00

C28 Cable, Breathing System 009-002928-00

C29 Cable, BFCS Position Switch 009-002930-00

C30 Cable, Total Flowmeter Backlight 009-002931-00

C31 Cable, Flowmeter Switch Signal 009-002929-00

C32 Cable, Backup Needle Valve Switch(without N2O) 009-005146-00

C34 Cable, Flow Sensor 009-002481-01

C35 Cable, Flowmeter 3 way Valve B 009-002937-00

C37 Cable, Ventilator 009-000979-00

C39 Cable, Three Way Valve(ACGO) 009-002592-00

No. Description P/N

Electrical and Pneumatic Connections Theory of Operation

1 - 6 046-006272-00 A7™ Service Manual

1.2.2 Pneumatic Connections (A7)

NOTE: The green tube in the tube diagram needs to paste the oxygen label.

NOTE: The orange tube in the tube diagram needs to paste the air label.

NOTE: The blue tube in the tube diagram needs to paste the N2O label.

NOTE: The black tube in the tube diagram needs to paste the neutral label.

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Mindray A7 User manual

Mindray A7 User manual

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